Welcome to the shack log of EI9ITB. Here you’ll find notes on homebrew radio projects, electronics, antennas, and anything else is coming through the receiver. Pull up a chair and tune in.
Recent Transmissions
-
A 3D Printed Reduction Drive For Variable Capacitors
When variable capacitors were in common use, it was easy to find mechanical reduction drives that would allow you to more finely adjust the frequency as you tuned across the dial. They were commonly available at 6:1, 8:1, and 10:1...
-
Homebrew RF Attenuators: Pi and T Pads on Copper Clad
In my last post I mentioned using a homebrew 23dB attenuator while aligning the BFO on my 20m rig. I had previously built a couple of them, in both pi and T configurations — a 23 dB T pad and...
-
Analog BFO Alignment with a NanoVNA
I’ve been making a lot of progress on my homebrew 20m SSB rig. I got all the parts roughly soldered together on the bench for testing. In order to get any sound out of an SSB receiver using the filter...